These boots feel too tight across my toes; could I try a size up?

How to say “These boots feel too tight across my toes; could I try a size up?” in Japanese

In Japanese

このブーツ、つま先(さき)がきついんですけど、一(ひと)つ上(うえ)のサイズを試(ため)してもいいですか。

Kono būtsu, tsumasaki ga kitsui n desu kedo, hitotsu ue no saizu o tameshite mo ii desu ka.

These boots feel too tight across my toes; could I try a size up? in other languages